Import data from text file

Question

0 个投票

I have a text files with two colums, when I used the

importfile(Data_Chan1.txt);

data=Data_Chan1(2:end,1:2);

I get error in reading the data.

5 个评论
显示 3更早的评论隐藏 3更早的评论

Ali Agha 2022-1-14

Data_Chan1.txt

I have this sample of the data

Ive J 2022-1-14

编辑：Ive J 2022-1-14

在 MATLAB Online 中打开

You need to mung your txt file, first few lines are totally messed up. Maybe you manually modified it (?).

doc readtable
doc readmatrix
doc readlines % to get a feel on your data structure 

请先登录，再进行评论。

请先登录，再回答此问题。

Follow Question

Answer 1

Kevin Holly 2022-1-14

编辑：Kevin Holly 2022-1-14

在 MATLAB Online 中打开

1 个投票

Data_Chan1.txt

I used the import data button on the toolstrip to import the text file. Then I generated the function below.

DataChan1 = importDataChanfile('Data_Chan1.txt');

size(DataChan1)

ans = 1×2

90112 2

data=DataChan1(2:end,1:2);

size(data)

ans = 1×2

90111 2

data

data = 90111×2 table

Time Amplitude __________ __________ 0.00019531 2.8167e-05 0.00039063 2.8191e-05 0.00058594 2.8337e-05 0.00078125 2.8255e-05 0.00097656 2.7935e-05 0.0011719 2.7522e-05 0.0013672 2.7267e-05 0.0015625 2.7049e-05 0.0017578 2.6771e-05 0.0019531 2.6771e-05 0.0021484 2.6546e-05 0.0023437 2.6159e-05 0.0025391 2.6179e-05 0.0027344 2.5608e-05 0.0029297 2.4605e-05 0.003125 2.3894e-05

plot(data.Time,data.Amplitude)

function DataChan1 = importDataChanfile(filename, dataLines)

%IMPORTFILE Import data from a text file

% DATACHAN1 = IMPORTFILE(FILENAME) reads data from text file FILENAME

% for the default selection. Returns the data as a table.

%

% DATACHAN1 = IMPORTFILE(FILE, DATALINES) reads data for the specified

% row interval(s) of text file FILENAME. Specify DATALINES as a

% positive scalar integer or a N-by-2 array of positive scalar integers

% for dis-contiguous row intervals.

%

% Example:

% DataChan1 = importfile("C:\Users\kevinh\OneDrive - MathWorks\Desktop\Data_Chan1.txt", [19, Inf]);

%

% See also READTABLE.

%

% Auto-generated by MATLAB on 14-Jan-2022 13:29:17

%% Input handling

% If dataLines is not specified, define defaults

if nargin < 2

dataLines = [19, Inf];

end

%% Set up the Import Options and import the data

opts = delimitedTextImportOptions("NumVariables", 2);

% Specify range and delimiter

opts.DataLines = dataLines;

opts.Delimiter = "\t";

% Specify column names and types

opts.VariableNames = ["Time", "Amplitude"];

opts.VariableTypes = ["double", "double"];

% Specify file level properties

opts.ExtraColumnsRule = "ignore";

opts.EmptyLineRule = "read";

% Import the data

DataChan1 = readtable(filename, opts);

end

2 个评论
显示无隐藏无

Ali Agha 2022-1-14

在 MATLAB Online 中打开

Thank you Kevin, it's really helpful to solve the issue but I'm still facing problem in running the data into the script below: appreciate if you can check it. For many days not able to identify the problem.

close all;clear;clc;
% Data_Chan1.txt --- x-dirention displacement signal
% Data_Chan2.txt --- y-dirention displacement signal
% Data_Chan3.txt --- y-acceleration signal
% Data_Chan4.txt --- z-acceleration signal
% modify the path to the file to be analysed
path = 'rub-impact/group1/900rpm/Throughput/Data_Chan1.txt');
time=DataChan1(:,1); % time sequency
x=DataChan1(:,2); % displacement signal sequency (x, y, or keyphasor, here is x)
fs=10240;    % samling freuency
% plot time waveform
figure
plot(t,x)
% plot spectrum
figure
plotfft(x,fs,'b')
% modify the path to the file to be analysed
path_2=load('rub-impact/group1/900rpm/Throughput/Data_Chan2.txt');
data=path(2:end,1:2);
t=data(:,1); % time sequency
y=data(:,2); % displacement signal sequency (x, y, or keyphasor, here is y)
% plot time waveform
figure
plot(t,y)
% plot spectrum
figure
plotfft(y,fs,'b')
% modify the path to the file to be analysed
path_3=load('rub-impact/group1/900rpm/Throughput/Data_Chan3.txt');
data=path_3(2:end,1:2);
t=data(:,1); % time sequency
y=data(:,2); % displacement signal sequency (x, y, or keyphasor, here is y)
% plot time waveform
figure
plot(t,y)
% plot spectrum
figure
plotfft(y,fs,'b')
% modify the path to the file to be analysed
path_4=load('rub-impact/group1/900rpm/Throughput/Data_Chan4.txt');
data=path_4(2:end,1:2);
t=data(:,1); % time sequency
z=data(:,2); % displacement signal sequency (x, y, z or keyphasor, here is z)
% plot time waveform
figure
plot(t,z)
% plot spectrum
figure
plotfft(z,fs,'b')
% plot keyphasor signal
path=load('rub-impact/group1/900rpm/Throughput/Data_Chan1.txt'); 
keyphasor=path(:,2); % displacement signal sequency (x, y, or keyphasor, here is keyphasor)
figure
plot(t,keyphasor)
% plot the orbit
path=load('rub-impact/group1/900rpm/Throughput/Data_Chan2.txt');
y=data(:,2); % displacement signal sequency (x, y, or keyphasor, here is y)
figure
plot(x,y)

Kevin Holly 2022-1-18

在 MATLAB Online 中打开

close all;clear;clc;

% Data_Chan1.txt --- x-dirention displacement signal

% Data_Chan2.txt --- y-dirention displacement signal

% Data_Chan3.txt --- y-acceleration signal

% Data_Chan4.txt --- z-acceleration signal

% modify the path to the file to be analysed

DataChan1 = importDataChanfile('Data_Chan1.txt');

% Alternatively, you can the command below to select the file

% filename = uigetfile;

% DataChan1 = filename

% path = 'rub-impact/group1/900rpm/Throughput/Data_Chan1.txt');

time=table2array(DataChan1(:,1)); % time sequency

x=table2array(DataChan1(:,2)); % displacement signal sequency (x, y, or keyphasor, here is x)

fs=10240; % sampling freuency

% plot time waveform

figure

plot(time,x) %change t to time

xlabel('Time')

ylabel('Displacement Signal Sequency')

% plot keyphasor signal

keyphasor=table2array(DataChan1(:,2)); % displacement signal sequency (x, y, or keyphasor, here is keyphasor)

figure

plot(time,keyphasor)

% plot spectrum

figure

pspectrum(x,fs) % plotfft(x,fs,'b')

% Import DataChan2

DataChan2 = importDataChanfile('Data_Chan2.txt');

%

% % modify the path to the file to be analysed

% path_2=load('rub-impact/group1/900rpm/Throughput/Data_Chan2.txt');

data=DataChan2(2:end,1:2);

t=table2array(data(:,1)); % time sequency

y=table2array(data(:,2)); % displacement signal sequency (x, y, or keyphasor, here is y)

% plot time waveform

figure

plot(t,y)

% plot spectrum

figure

pspectrum(y,fs)

% plot the orbit

figure

plot(x,y(1:length(x)))

% Import DataChan3

DataChan3 = importDataChanfile('Data_Chan3.txt');

data=DataChan3(2:end,1:2);

t=table2array(data(:,1)); % time sequency

y=table2array(data(:,2)); % displacement signal sequency (x, y, or keyphasor, here is y)

% plot time waveform

figure

plot(t,y)

% plot spectrum

figure

pspectrum(y,fs)

% Import DataChan4

DataChan4 = importDataChanfile('Data_Chan4.txt');

data=DataChan4(2:end,1:2);

t=table2array(data(:,1)); % time sequency

z=table2array(data(:,2)); % displacement signal sequency (x, y, or keyphasor, here is y)

% plot time waveform

figure

plot(t,z)

% plot spectrum

figure

pspectrum(z,fs)

请先登录，再进行评论。

Import data from text file

5 个评论
显示 3更早的评论隐藏 3更早的评论

采纳的回答

2 个评论
显示无隐藏无

更多回答（0 个）

类别

标签

Community Treasure Hunt

Import data from text file

5 个评论 显示 3更早的评论 隐藏 3更早的评论

采纳的回答

2 个评论 显示 无 隐藏 无

更多回答（0 个）

类别

标签

另请参阅

Community Treasure Hunt

5 个评论
显示 3更早的评论隐藏 3更早的评论

2 个评论
显示无隐藏无